[Authentification] Allow customisation of password field name for default eloquent provider

[WeeskyBDW]

Hi
i think it can be really usefull to allow devs to customize the password field on Laravel default authentification system. Currently, password field is hardcoded and this made we have to create a custom provider that extend eloquent provider.

Why this change ?
i dont see why we should be allowed to customize other fields but not password. It will also improve flexibility of the authentification.

How to implement that ?
i was thinking to an optional 3rd argument of string type that allow to say to laravel what field is password field.

i'm open to any idea